Preprints
https://doi.org/10.5194/hess-2024-51
https://doi.org/10.5194/hess-2024-51
13 Mar 2024
 | 13 Mar 2024
Status: this preprint is currently under review for the journal HESS.

On the Influence of Spatial Heterogeneity of Runoff Generation on the Distributed Unit Hydrograph for Flood Prediction

Bin Yi, Lu Chen, and Tao Xie

Abstract. The spatial scale mismatch between runoff generation and runoff routing is an acceptable compromise but a common issue in challenging hydrological modelling. Moreover, there is hardly any report available on whether unit hydrograph (UH) that is consistent with the spatial scale of runoff generation can be computed. The objective of this study was to explore the influence of spatial heterogeneity of runoff generation on the UH for flood prediction. To this end, a novel GIS-based dynamic time-varying unit hydrograph (DTDUH) was proposed based on the time-varying unit hydrograph (TDUH). The DTDUH can be defined as a typical hydrograph of direct runoff which gets generated from one centimeter of effective rainfall falling at a uniform rate over the saturated drainage basin uniformly during a specific duration. The DTDUH was computed based on the saturated areas of the watershed instead of the global watershed. The saturated areas were extracted based on the TWI. Finally, the Longhu River basin and Dongshi River basin were selected as two case studies. Results showed that the proposed method exhibited consistent or better performance compared with that of the linear reservoir routing method, and performed better than the TDUH method. Specifically, the DTDUH method indicated good performances for the flood events with low antecedent soil moisture, and it performed consistently with the TDUH when the global watershed is nearly saturated. The proposed method can be used for the watersheds with sparse gauging stations and limited observed rainfall and runoff data, as is the same with the TDUH method. Simultaneously, it is well applicable for the humid or mountain watershed where the saturation-excess rainfall is the dominant.

Bin Yi, Lu Chen, and Tao Xie

Status: open (until 17 May 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Bin Yi, Lu Chen, and Tao Xie
Bin Yi, Lu Chen, and Tao Xie

Viewed

Total article views: 197 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
161 28 8 197 14 7 6
  • HTML: 161
  • PDF: 28
  • XML: 8
  • Total: 197
  • Supplement: 14
  • BibTeX: 7
  • EndNote: 6
Views and downloads (calculated since 13 Mar 2024)
Cumulative views and downloads (calculated since 13 Mar 2024)

Viewed (geographical distribution)

Total article views: 194 (including HTML, PDF, and XML) Thereof 194 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 12 Apr 2024
Download
Short summary
A novel GIS-based dynamic time-varying unit hydrograph (DTDUH) was proposed. The DTDUH was computed based on the runoff generation areas of the watershed instead of the global watershed. Two watersheds were selected as case studies and results showed the DTDUH method indicated good performances for the flood events with low antecedent soil moisture.